I fancy the number 9. It's the easiest number for configuring mathematics: all digits in the sum, added up, will ultimately equal 9. If they don't, then you have the wrong answer to the equation. Also this fun little thing:
09
18
27
36
45
54
63
72
81
90
Look at the left column: It's 0123456789. Look at the right column. It's 9876543210. The 9 table will do this to infinity.
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